System of control.



PATENTED OCT. 1, 1907.

B. R. CARICHOFF.

SYSTEM OF CONTROL.

APPLICATION TILED JAN 19 1900 lnvenCo r Eugene H. CnrichoE-F. M-

f 5 UNITED, sTArEs PnrEN-r orFion.

EUGENE R. GARICHOFF, OF FAST O RANGE, NEW JERSEY, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

SYSTEM OF CONTROL.

Patented Oct. 1,1907.

Application tiled January 19, mos. Serial Massages.

5 new and useful Improvements invSy stems of Control,

for which the following is aspecificatiou.

- The present invention relates to systems of control for electrictranslating devices, particularly hlcctric' .motors, and comprises anovel construction and arrangement of parts to be hereinafter describedand particularly pointed outin the claims. I

The present invention will be more :lully understood and the advantagesthereof will appcaifrom the following description-taken in connection,with the accompanying drawing which illustrates diagrammaticallyand'conventionall'y a preferred form Beference being had to the drawing,M and M indicate two motors which are illustratedas prdinaryserieslmoto'rs such as are commonly used in electric railway 2 )service butwhich may be of any other usual or pre- I so I 'ferred,type.

T represents a current collectingi device engaging with a conductor ortrolley wire f R S is a reversing switch, adapted to govern the relaofthe motors in order to vary the direction of rotation of the motors. f Ais a switch apparatus for connecting the motors to the source of currentsupply. 5 i R, R and R are clectmmagnctically-actuated switches adaptedto control the amount of resistance in the motor circuit.

B is a device cooperating with tl.e switch device A in order that themotors may lie connected in series and in parallel at will; Q j r lis amaster reversing switch, C a master controller. The reversirgswitchappiu'atus is of an old and well-known type and the switihr mechanism AB is substantially the same as'thc sw itch controlled by the solenoids Aand F in Patent NJ. 7 77,883, granted on'December 20,1901, on anapplication filed by rue.

The parts are so arranged that the switches R, R and R my be closed inautomatic succession or may be controlled at will from the mastercontroller. The resistancdcontrolling switches are each provided withtwo coils '1 and -2; the coils 1, as will hereinafter appear, being'connected in shunt to the motor armatures and tending to=close the switchesto cut out seetionis coi resistance, while the coils 2 are connectedtive connections hr the field armature windings directly {cross the lineand oppose the actuating coils.. This arrangement is advantageous wherethe line current would have to drop below the desired value heloreresistance would be cut out when the line voltage fell below the normalvalue. By adding the 0pposing coils, which are connected directly acrossthe line, an equalizing efiectis produced, for when the line voltagerises the actuating coils must overcome a stronger opposing pull thanunder normal conditions,

while when the line voltage falls, the opposing pull is less than thenormal opposing pull.

The switch apparatus A comprises a solenoid a tending, when energized,to close the switches a, a a and a. 7 4 r The device B comprises thesolenoid b, opcratinga selective device I), which, when thesolenoid isdenergized, prevents thoiswitchcsa and a. hour closing; and when. thesolenoidis energized, prevents switch a alone from closing, and switches(P, a and a being then free to close; I Whenthe master reversing switchis moved to either the position f f or r r, master controller is movedtoiislirst running position, the main reversing switch is operated togive the motor con nections corresponding the position oithe masterreverser and the actua't g circuit for the-reversing switch is thenshifted in the usual manner to wire 3, thence through the actuatingsolenoids, through interlock b'- of solenoid b, to ground. The solenoida, being energized, closes switches a and a", switches a it" and a beingrestrained by the selective device. The

motor circuit niaynow be traced from-trolley through switch a,resistance sections r, r, r, through one side of the reversing switchand motor M, to switch a, through resistance sections r, r and 1',through th other side of the reversing switch and motor )4, to ground; abranch circuit also passes from point 4 through the coils 2 of theresistance switchto ground. When the master controller is moved to thethird running position, namely, wherein themovable contacts engage withfixed contacts alongline 3 3, the motor circuit remains unchanged, butthe branch circuit ex tends from point 5 located between resistancesections r, 1- arid r, and-the motors, through contacts 3", c, c, 6,through the actuating 'coil 1 ol the resistance switch R, to ground. Ifthe motor speed is low, so that but little current flows through theshunt circuit containing the actuating coil of resistance switch R, thisresistance 1 O0 switch is not closed, but remains open uni il thecounterelectro motive force of the motors has reached such a value thatcoil 1 is able to overcome the opposition of coil 2 and, when thishappens, the .witli R is closed and resistancesectionsr and rarecu touf.Inthesameway,

in the fourth running position of the controller, the actu,

sting coil for switch R is cut in, and in.position 6- the actuating coilof switch R. In each case, however, the

closing of successive resistance switches is dependent upon theexistence of a definite relation between the counterelectromotive forceof the motors and theelec: tromotive force of the source of supply;

It is noted that if the master controller is initially moved to itsfifth running position, namely, that position wherein the fixed contactsengage the movable have been closed. In the sixth running position ofthe controller, the circuits of the actuating coils of the resistanceswitches are interrupted and current passes from trolley .throughcontacts 1, c, c and 4", through the solenoid b, through interlockingcontact 5, connected to resistance switch R, thence to ground. Theenergizing of solenoid b causes the selective device b to be raised andcontacts b to be opened; thereiore the solenoid a is deenergi'zed andthe switches a to a are all opened and consequently all the circuits areinterrupted. The solenoid b completes a circuit in itself independent ofthe switch 8 through an auxiliary switch b, to ground. The circuitincluding solenoid a is again completed by reason of movable contactmember b, controlled by solenoid b, which contact member now engageswith the fixed ontactmembers of interlock b". Solenoid a, being againenergized, places switches a nfiunder tension and all of 'theseswitches, except switch a are closed. The motors are now connected inparallel, motor M being in series with rcsist-' ances r to r, and motorM in series with the remaining resistance sections. As the mastercontroller is turned into and through its further r unning positions theresistance switches are again closed in a manner described,

i l l What I claim as newinddesire fol-secure by Letters Patent of theUnitedlStates, is,,,.'-' i 1. In combination, a soiirceot currentsupply, a motor or motors connected to said source '0! supply, a;controlling device -for said motor or motors, an actuating coil for saiddevice whose current depends upon the counters-lee tromotive force ofsaid motor or motors. rind-a coil whose current depends upon thepotential ot saidsonrce of current supply, said latter cell beingarranged to oppose the actuating coll.

2. In combination, a source of'current supply, a motor or motorsconnected to said source 0! supply, it controlling device for said motoror motors, actuating and opposing coils associated with said controllingdevice. means connecting said opposing coil directly to said source ofsupply, and means connecting-said actuating coil ln hunt to the motorarmature or urmaturcs. V

, 3. In combination. a source or current supply, a motor or motorsconnected to said source of supply, a speed controller'comprising aplurality of individual switches and actuating coils constructed andarranged to operate said switches in succession as thecountcrelectromotive force of saidmotor or motols increases. andopposing coils for said switches connected directly to said source 0!current supply.

4. in combination, 11 source of current supply, a motor or motorsconnected to said source of supply, a resistance in the motorcircuir, aseries of individual switches connccted to said resistance for cutting'it out step by step. actuating coils associated with said switches,means or connecting said actuating coils to the source of current supplyin series with said resistance and in shunt to said motor or moi'ors,the arrangement being such that the switches are operated successivelyas the countereiectromdtive force bf the motor rises. and opposing coilsfor said switches ,connec'teddlrectiy to said dour-cc of supply.

5. in combination. a source o1 current supply, u motor or motorsconnected to said source of current supply, in motor controllercomprising a plurality of" individual switches, electromagneticactuutlng menus for said switches controlled by ihe countereiectromotireforce of said motor or motors and arranged to close said switches .inautomatic progression, a master switch, and meettions between saidmaster switch and said actuating means for interrupting the'automaticprogression of said switches at any point. I

In witness whereof; I have hereunto set-my hund this seventeenth (is yof January, 1906.

EUGENE R. QARICHOFF.

